Iron Root Double-Head Double-Helix Earth Anchor, 5/8 in. Rod x 30 in. L x 4 in. Helix, Class 2 - Pack of 8Ground anchors are designed for different soil classifications: longer models for loose soils, shorter models for harder soils. Prior to installing any ground anchor model, the soil must be tested (with a soil test probe) in order to match approved ground anchor model with site soil class. Ground anchor comes in a black painted finish. Double helix design with a shank length of 30". Tested to HUD Regulation 3280 to withstand a working load of 3,150